Abstract: An identification system comprises removable fittings for the pressure lines or hoses. The identification system in particular comprises sets of matched identification fittings which are joinable together, but separable for individual mounting to respective ones of a pressure line fitting and the port to which the pressure fitting is connected. The identification fittings have matched surface indicia, which has a unique identifier that is common to both of the matched identification fittings provided as a set. For example, one set of identification fittings may each be marked with a visible indicator such as a common letter such as a capital A.

Abstract: A method and apparatus for designing very large scale integrated circuit devices, most particularly level sensitive scan design (LSSD) devices, by inclusion of a plurality of distributed delay lines originating at input terminals of the device, and controlling the inhibiting and enabling of driver circuits connected to the output terminals of the device, as required to regulate operation of device drivers during a plurality of testing operations.

Abstract: A performance-sensing element (PSE) circuit detects the actual speed of other circuits on the same chip by launching a pulse into a tapped cascade of circuits on the chip, then detecting how far the pulse has progressed after a known interval. Control signals indicating circuit speed can stabilize parameters of the other circuits, such as rate of change of current (di/dt) in driver circuits, absolute delay of clock signals from one chip to another, and relative delay of multiple clock signals within the chip.